<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .box1{
            width: 200px;
            height: 200px;
            border: 1px solid black;
            display: flex;
            justify-content: space-around;
        }
        .b1{
            display: flex;
            flex-direction: column;
            justify-content: space-around;
        }
        .b11{
            width: 100px;
            height: 100px;
            background-color: palegreen;
        }
        .b12{
            width: 100px;
            height: 100px;
            background-color: pink;
        }
        .b2{
            width: 100px;
            height: 200px;
            background-color: aqua;
        }

        /* 第二个盒子 */
        .box2{
            width: 300px;
            height: 400px;
             background-color: aqua;
             display: flex;
             flex-direction: column;
             justify-content: space-around;
        }
        .box21{
            width: 100%;
            height: 80px;
            background-color: blueviolet;
        }
        .box22{
              flex: 1;  
              background-color: blue;  
              overflow: hidden; 
              overflow-y: scroll; 
        }
        .box23{
            width: 100%;
             height: 80px;
        }
       .box3{
         width: 100%;
         height: 600px;
         border: 1px red solid;
         display: flex;
         justify-content: center;
         align-items: center;
       }
       .box3-1{
         width: 95%;
         height: 95%;
         background-color: aquamarine;
       
         
       }
       .b31{
         width: 100%;
         height: 100px;
         background-color: aqua;
         display: flex;
         justify-content: space-around;
       }
       .b31-1{
        width: 100px;
        height: 100%;
        background-color: blueviolet;
       }
       .b31-2{
         height: 100%;
         flex: 1;
         background-color: rgb(244, 156, 185);
       }
       .b32{
        width: 100%;
        height: 400px;
        background-color: beige;
        display: flex;
        justify-content: space-around;
       }
       .b32-1{
          flex: 3;
          background-color: paleturquoise;
       }
       .b32-2{
          flex: 5;
          background-color: mediumspringgreen;
       }
       .b32-3{
          flex: 1;
          background-color:skyblue;
       }
    </style>
</head>
<body>
     <div class="box1">
        <div class="b1">
            <div class="b11">1</div>
            <div class="b12">2</div>
        </div>
        <div class="b2">3</div>
     </div>

     <!-- 第二个盒子 -->
     <div class="box2">
        <div class="box21">1</div>
        <div class="box22">
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
            <div>123</div>
        </div>
        <div class="box23">3</div>
     </div>

     <!-- 第三个盒子 -->
     <div class="box3">
        <div class="box3-1">
            <div class="b31">
                <div class="b31-1"></div>
                <div class="b31-2"></div>
            </div>
            <div class="b32">
                 <div class="b32-1">a1</div>
                 <div class="b32-2">a2</div>
                 <div class="b32-3">a3</div>
            </div>
            <div class="b33">3</div>
        </div>
        
     </div>
</body>
</html>